I had a 2000 1150GS. The four valve "oil heads" are not as classic looking as the old two valve airheads that you're thinking of. I had one of those too, a '77 R100RS. But the oilheads make a lot more power and are much more refined. The 1150 is a nice highway cruising machine with the tall 6th gear and roomy layout. I did a two week two up tour with my wife on mine.
Like Jay's H2 vid...... power goes up with time..... a good thing, when used responsibly
I've seen guards for the modern HP2's, like this one....
2006 BMW HP2 Enduro R1200GS for sale on 2040-motos
Rgds, D.